Negative Ion-Releasing Silica Compositions and Methods of Preparing and Using the Same

Abstract

Negative ion-releasing silica compositions and methods for their preparation and use are described herein. The compositions include silicon dioxide and gadolinium. Further described herein are products including the compositions.

1 . A composition, comprising:
 silicon dioxide; and   gadolinium.   
     
     
         2 . The composition of  claim 1 , wherein the silicon dioxide is present in an amount of 20% to 30% based on the weight of the composition. 
     
     
         3 . The composition of  claim 1 , wherein the gadolinium is present in an amount of 0.1% to 0.5% based on the weight of the composition. 
     
     
         4 . The composition of  claim 1 , further comprising a lanthanide. 
     
     
         5 . The composition of  claim 4 , wherein the lanthanide is selected from the group consisting of neodymium, praseodymium, cerium, or a mixture of these. 
     
     
         6 . The composition of  claim 4 , wherein the lanthanide is present in an amount of 2% to 5% based on the weight of the composition. 
     
     
         7 . The composition of  claim 1 , further comprising tourmaline, germanium, zeolite powder, hematite, or a mixture of these. 
     
     
         8 . The composition of  claim 1 , further comprising an additional oxide. 
     
     
         9 . The composition of  claim 8 , wherein the additional oxide is selected from the group consisting of aluminum oxide, calcium oxide, iron oxide, magnesium oxide, sodium oxide, sulfur dioxide, titanium dioxide, zirconium dioxide, or a mixture of these. 
     
     
         10 . The composition of  claim 8 , wherein the additional oxide is present in an amount of 40% to 65% based on the weight of the composition. 
     
     
         11 . The composition of  claim 1 , further comprising a mineral acid. 
     
     
         12 . The composition of  claim 11 , wherein the mineral acid is phosphoric acid. 
     
     
         13 . A composition, comprising:
 silicon dioxide in an amount of 23% to 26% based on the weight of the composition;   gadolinium in an amount of 0.1% to 0.3% based on the weight of the composition;   aluminum oxide in an amount of 1.6% to 1.9% based on the weight of the composition;   calcium oxide in an amount of 0.1% to 0.5% based on the weight of the composition;   iron oxide in an amount of 0.1% to 0.5% based on the weight of the composition;   sodium oxide in an amount of 0.01% to 0.1% based on the weight of the composition;   titanium oxide in an amount of 0.2% to 0.4% based on the weight of the composition;   zirconium dioxide in an amount of 50% to 60% based on the weight of the composition;   phosphoric acid in an amount of 6% to 8% based on the weight of the composition;   cerium in an amount of 0.1% to 1% based on the weight of the composition; and   sulfur dioxide in an amount of 0.01% to 0.1% based on the weight of the composition.   
     
     
         14 . The composition of  claim 13 , further comprising neodymium in an amount of 1% to 2% based on the weight of the composition; and praseodymium in an amount of 1% to 2% based on the weight of the composition. 
     
     
         15 . The composition of  claim 13 , further comprising zeolite powder in an amount of 1% to 2% based on the weight of the composition; and tourmaline in an amount of 1% to 2% based on the weight of the composition. 
     
     
         16 . A product comprising the composition of  claim 1 , wherein the product is a wristband, an insole, a clothing item, or a hat. 
     
     
         17 . The product of  claim 16 , further comprising an adhesive. 
     
     
         18 . The product of  claim 17 , wherein the adhesive comprises tourmaline. 
     
     
         19 . The product of  claim 16 , wherein the clothing item is a shirt.